These three works[1]}, [2]}, [3]} are the only experimental emulations of the 4D QHE to date, and many aspects related to the effect remained un-confirmed. Certainly, an experimental setup where both the spatial and frequency domains can be simultaneously resolved is missing. Even with the aperiodic principles at hand, the designs remained challenging, perhaps because it is falsely assumed that the models need to simulate the Hofstadter Hamiltonians as close as possible. However, as pointed out by Apigo et al,[4]} no fine tuning is actually necessary to open topological gaps. The latter only require strong aperiodicity and strong couplings between the resonators, as well as a reliable strategy for the phason engineering that produces the desired topological phases.[5]} Guided by these principles, we demonstrate here a robust design of a quasi-periodic 2D acoustic crystal that hosts the 4D quantum Hall physics. Reconfigurability and other advantages of the experimental setup enables us to map, the Weyl singularity predicted by the bulk-boundary correspondence.[6]} Furthermore, we demonstrate ways to control and steer the boundary modes using the phason, that are specific only to 4D QHE.
